Can we re-use their assets in our own projects? Are we free to modify them? There is some cool stuff in there.
From the FAQ:
What can I do with this free content?
You can use template games to build and ship your own projects. We encourage you explore, deconstruct and modify the sample games and example content as you like. You can use this content for your own game projects, too!
Ahh, I’d not seen that they had an FAQ… very interesting, thanks!